"With regard to our carbon filter materials, I believe there is some need for clarification over why the material performs differently to a regular granular carbon cloth. The filters we use are 100% pure activated carbon cloth which is broken down into a yarn then spun into a cloth. If you were to have a carbon powder with the same particle size as the filament diameter as the cloth, the adsorption characteristics would be pretty much the same. The only thing would be that you would not be able to breathe through the powder, because the pressure drop would be so high. The key differentiator with our filters is that it allows very fast adsorption kinetics at a very low pressure drop. Hence you can make a viable gas filter out of just one or two layers other than a thick bed. The larger the carbon particle size, the lower the kinetics, but also the lower the pressure drop. The challenge for filter designers when using granular carbon is to balance the bed depth, the grain size and the pressure drop in order to get the required properties for the filter.

With regard to exactly which pollutants are filtered by the carbon cloth, a general rule of thumb is that chemicals that boil above 65 deg C are easily removed by unimpregnated carbon. Organophosphates are easy to remove. Silver acts as a catalyst for removing arsen and phosphine. For particulate pollution, you can see from the N99 report form Nelson Lans that our masks are proven under NIOSH 42 CFR to filter 99.7%+ of particulate matter down to 0.3 microns. Additionally, we tested for viral and bacterial filtration, and filter 99.6 and 99.6 percent respectively." (quote)

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